Terahertz spectroscopy of explosives and simulants: RDX, PETN, sugar, and L-tartaric acid

Konek, Christopher T.; Wilkinson, John; Esentürk, Okan; Heilweil, Edwin J.; Kemp, Michael

doi:10.1117/12.817913

Cited by 37 publications

(22 citation statements)

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“…For example, RDX has a prominent absorption peak at 0.82 THz. [37] Decision criteria for the particular substance are defined by a multispectral data analysis. [33] Various computational molecular modeling algorithms have been tested to assign observed absorption frequencies of a crystal to particular crystal modes (such as bending modes or phonons).…”

Section: Solidsmentioning

confidence: 99%

Terahertz Time‐Domain Spectroscopy of Gases, Liquids, and Solids

et al. 2011

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The techniques and methods employed in the spectroscopic characterization of gases, liquids, and solids in the terahertz frequency range are reviewed. Terahertz time-domain spectroscopy is applied to address a broadband frequency range between 100 GHz and 5 THz with a sub-10 GHz frequency resolution. The unique spectral absorption features measured can be efficiently used in material identification and sensing. Possibilities and limitations of fundamental and industrial applications are discussed.

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Section: Solidsmentioning

confidence: 99%

Terahertz Time‐Domain Spectroscopy of Gases, Liquids, and Solids

et al. 2011

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“…Hence, there are lots of promising applications in THz spectroscopy including the inspection of semiconductors, 1 polymers, 2 bio-molecules, 3 pharmaceutical ingredients, 4 drugs, 5 and explosives. 6 It is even possible to measure spectra of samples which are covered by dielectric materials (for example, hidden behind clothes or packed in cardboard). 7…”

Section: Introductionmentioning

confidence: 99%

Compact fiber-coupled terahertz spectroscopy system pumped at 800 nm wavelength

Ellrich

Weinland

Molter

et al. 2011

Review of Scientific Instruments

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Photonic terahertz (THz) technology using femtosecond (fs) lasers has a great potential in a wide range of applications, such as non-destructive testing of objects or spectroscopic identification of chemical substances. For industrial purposes, a THz system has to be compact and easily implementable into the particular application. Therefore, fiber-coupled THz systems are the key to a widespread use of THz technology. In order to have flexible THz emitters and detectors near infrared fs light pulses have to be sent through optical fibers of considerable length. As a consequence, the fiber's dispersion has to be compensated for and nonlinear effects in the fiber have to be minimized. A fiber-based THz time-domain spectroscopy system of high stability, flexibility, and portability is presented here.

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“…Over the past years many investigations and applications of terahertz (THz) radiation (Tray) have taken place in connection with the actual problems mentioned above [1][2][3][4][5][6][7][8][9][10][11][12]. The reason is that the spectra of many important non-organic and organic molecules lie in the terahertz range.…”

Section: Introductionmentioning

confidence: 99%

Identification of explosive media using spectrum dynamics under the action of a THz pulse

et al. 2009

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A method of THz spectral dynamics analysis (SDA) of medium response in the THz and GHz ranges, which was developed by us in previous papers for detection and identification of materials, is used for the treatment of experimentally measured signals, passed through selected explosives, including those hidden under covering materials. This technique is based on the window sliding method and on restoration of the THz pulse. It allows researchers to follow the dynamics of many spectral lines in one set of measurements simultaneously and to obtain the full information about the spectrum dynamics of the THz pulse. Relaxation time of rotational transitions, for example, can be determined too. This information gives an opportunity to detect and identify materials despite the similarity in their THz spectra -which may be identical. We show that the spectrum dynamics of THz pulses, passed through the explosives hidden under plastic, cotton and leather barriers -covers, differ widely for these media despite little difference in their spectra. Consequently, our method allows for detection and identification of the hidden explosives with high probability.

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Terahertz spectroscopy of explosives and simulants: RDX, PETN, sugar, and L-tartaric acid

Cited by 37 publications

References 0 publications

Terahertz Time‐Domain Spectroscopy of Gases, Liquids, and Solids

Terahertz Time‐Domain Spectroscopy of Gases, Liquids, and Solids

Compact fiber-coupled terahertz spectroscopy system pumped at 800 nm wavelength

Identification of explosive media using spectrum dynamics under the action of a THz pulse

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